This topic describes how to determine the number of domain names you require when you purchase an Anti-DDoS Pro or Anti-DDoS Premium instance.

Every 10 additional domain names must belong to the same top-level domain name.
  • An Anti-DDoS Pro instance can support 50 domain names, which belong to only five top-level domain names.
  • An Anti-DDoS Premium instance can support 10 domain names, which belong to only one top-level domain name.

Assume that you want to purchase an Anti-DDoS Pro instance. The instance protects five top-level domain names, such as abc.com. Then you can add 50 subdomains and wildcard domains for the top-level domain names, such as www.abc.com, *.abc.com, mail.abc.com, user.pay.abc.com, and x.y.z.abc.com.

Note All added domain names, which include the top-level domain names, such as abc.com, count in the quota for protected domain names.

If you need to add more top-level domain names or the subdomains of a new top-level domain name, you must increase the maximum number of domain names. If you have added five top-level domain names or the subdomains of five different top-level domain names, and you want to add a new top-level domain name or a subdomain of a new top-level domain name, a notification appears to remind you of increasing the number of domain names.

In this case, you must upgrade your instance to support additional domain names.